use of structure codes (counts) for computing topological indices of carbon nanotubes: sadhana (sd) index of phenylenes and its hexagonal squeezes

structural codes vis-a-vis structural counts, like polynomials of a molecular graph, areimportant in computing graph-theoretical descriptors which are commonly known astopological indices. these indices are most important for characterizing carbon nanotubes(cnts). in this paper we have computed sadhana index (sd) for phenylenes and theirhexagonal squeezes using structural codes (counts). sadhana index is a very simple w-sz-pitypetopological index obtained by summing the number of edges on both sides of theelementary cuts of benzenoid graphs. it has the similar discriminating power as that of theweiner (w)-, szeged (sz)-, and pi-indices.